OpenSilver - Web-native WPF

Open-source .NET UI framework for web apps with C#/VB/F#. Brings WPF & Silverlight to the Web via HTML & WebAssembly. Try it online, zero setup:

[OpenSilver - Web-native WPF @OpenSilverTeam]

Our browser-based .NET IDE (@xaml_io) now has code sharing and NuGet packages

[XAML.io — Online .NET IDE @xaml_io]

Many thanks to @Iprogrammerinfo for covering the launch of https://t.co/9enTyWD0I1 v0.7!

Link to the article: https://t.co/KFUHiPZanC

[OpenSilver - Web-native WPF @OpenSilverTeam]

@YBTopaz8 Thank you!

[Yvan Brunel. @YBTopaz8]

I got the controls sample and it's nice because I could just load it and run from visual studio.
Love the controls!!
It's got more than Maui out of the box, that's really great.
I think there's no "alert dialog" included but well I'll just use child windows.
Kudos!

[XAML.io — Online .NET IDE @xaml_io]

Thank you, @SDTimes, for covering our 0.7 release!
https://t.co/xnjH98sgaO

[OpenSilver - Web-native WPF @OpenSilverTeam]

@YBTopaz8 Thanks a lot. Implementing XAML hot reload and improving the documentation are definitely two of our top priorities.

[XAML.io — Online .NET IDE @xaml_io]

It turns out you can ad-hoc sign a macOS .app from inside Chrome on Windows.

https://t.co/9enTyWD0I1 v0.7 publishes native C#+XAML desktop apps for Windows, macOS and Linux. All packaging and signing run in WebAssembly, in your browser.

Free, no signup:
https://t.co/vKprMEP8rK

[OpenSilver - Web-native WPF @OpenSilverTeam]

@James_M_South Thank you! I just asked internally: we ported a C++ algorithm from WPF to OpenSilver C# ("it's a Bentley-Ottmann sweep-line algorithm adapted for boolean operations on planar subdivisions").

[OpenSilver - Web-native WPF @OpenSilverTeam]

WPF… in the browser?

We just implemented full CombinedGeometry support! (OpenSilver 3.4-Preview).

Live demo with code: https://t.co/6onjSMm9Lp

[OpenSilver - Web-native WPF @OpenSilverTeam]

@BankQuote 👋 OpenSilver team here. Looks like there may be a naming collision. Just to avoid confusion: the official OpenSilver project is under the OpenSilver GitHub org. Happy to clarify!

[OpenSilver - Web-native WPF @OpenSilverTeam]

Thanks!

We implemented CombinedGeometry because it was needed to faithfully support WPF’s FrameworkElement.LayoutTransform.

One of the subtleties is that LayoutTransform affects layout, and clipping has to be applied after the transform. That behavior is different from a simple RenderTransform, so supporting CombinedGeometry helped us reproduce clipping more accurately.

In general, our goal with OpenSilver is to make it as easy as possible to bring existing WPF applications to the web, by supporting the WPF API surface and behavior wherever we can.

Why the web? Easier deployment, broader platform reach, stronger sandboxing/security, and the ability to benefit from browser features such as accessibility tools, Ctrl+F, text selection, translation, browser extensions, and more.

OpenSilver renders UI using real DOM elements, which is an important part of making those benefits available.

For anyone curious, there’s a live playground here: https://t.co/AeNpmKTlmd

[XAML.io — Online .NET IDE @xaml_io]

NEW:

Build .NET desktop apps for Windows, macOS, and Linux. From your browser. Under 30 seconds.

No install. No sign-in. Free.

Everything runs in WebAssembly. Your code never leaves your machine.

Yes, even the macOS ad-hoc code-signing.

🔗 https://t.co/Y1dlBsms4p

[OpenSilver - Web-native WPF @OpenSilverTeam]

@MattParkerDev Very nice!

[OpenSilver - Web-native WPF @OpenSilverTeam]

Most UI frameworks are still trying to catch up
to what WPF got right 20 years ago.

Today we added support for
FrameworkElement.LayoutTransform
to the OpenSilver develop branch,

as we continue bringing the power of WPF
to the native web.

[OpenSilver - Web-native WPF @OpenSilverTeam]

Congrats to Microsoft for releasing .NET 11 Preview 4 today!
https://t.co/31j3jVuhls

[XAML.io — Online .NET IDE @xaml_io]

We improved in-browser App Preview isolation on Chrome

so infinite loops in your app no longer freeze the IDE.

Just close the App Preview tab to stop your app.

Firefox can still freeze the IDE, but after a few seconds you’ll see a prompt to stop the preview.

[XAML.io — Online .NET IDE @xaml_io]

New on https://t.co/9enTyWD0I1: shared codebases can now open exactly how you want.

Choose the starting experience for the person opening your link:
• auto-run the app
• show code + preview side by side
• open to a specific file

Great for snippets, demos, and .NET tutorials.

[OpenSilver - Web-native WPF @OpenSilverTeam]

Nice!

[K. Sakapon @saka_pon]

WPF (デスクトップ) と OpenSilver (ブラウザー) の実行結果。
ブラウザー上のアプリで簡単にリキッドレイアウトにできるのが素晴らしい。

[OpenSilver - Web-native WPF @OpenSilverTeam]

👀

[K. Sakapon @saka_pon]

せっかくだから、WPF から OpenSilver に移植してみた。形式的な部分を除けばほぼ同一のコードで、デザイナー画面はこんな感じ。

[XAML.io — Online .NET IDE @xaml_io]

You can now export your .NET app as a native Windows .EXE — straight from the browser.

No install. No signup. No backend. Pure WebAssembly. Free.

Try it: https://t.co/Y1dlBsms4p

Building the best place to design, build, and run C# + XAML cross-platform in 2026. 🛠️

[XAML.io — Online .NET IDE @xaml_io]

Use this new toggle (at runtime) to switch between Single View and Split View (code + running app side by side)